Different from the initial selection datasheet of mcu and request for advice on improving modbus speed

[seokgi]

Hello?
I use serial transmission a lot in my project.
So I use MCU with many serials.

It seems that there is an error in the part where I select the initial model of the attached fc10.

In fact, the datasheet shows only 6 UARTs. And there is no USB.
Please check.

And it is very slow when communicating with modbus.
It is set as slave and is communicating with about 30 addresses.
However, the communication is very slow and the update speed is also slow in hmi and modbus poll.

Please give me some advice.

Thank you.